Investigation of the Nd$_2$O$_3$--Lu$_2$O$_3$--Sc$_2$O$_3$ phase diagram for the preparation of perovskite-type mixed crystals NdLu$_{1-x}$Sc$_x$O$_3$

Tamino Hirsch; Christo Guguschev; Albert Kwasniewski; Steffen Ganschow; Detlef Klimm

doi:10.1016/j.jcrysgro.2018.10.003

paper

Investigation of the Nd $_{2}$ O $_{3}$ --Lu $_{2}$ O $_{3}$ --Sc $_{2}$ O $_{3}$ phase diagram for the preparation of perovskite-type mixed crystals NdLu $_{1 - x}$ Sc $_{x}$ O $_{3}$

arXiv:1806.05606 · doi:10.1016/j.jcrysgro.2018.10.003

Abstract

Based on differential thermal analysis (DTA) and X-ray powder diffraction (XRD), a description of the system Nd $_{2}$ O $_{3}$ --Lu $_{2}$ O $_{3}$ --Sc $_{2}$ O $_{3}$ was obtained by thermodynamic assessment. Four fields of primary crystallization could be identified; from melt compositions close to the Lu $_{2}$ O $_{3}$ --Sc $_{2}$ O $_{3}$ edge the rare-earth oxide C-phase crystallizes first, which is stable down to room temperature. From Nd $_{2}$ O $_{3}$ rich melts the X-phase forms, which is stable only at high temperatures. An additional field, where the alternative high-temperature phase H solidifies as primary product touches the Nd $_{2}$ O $_{3}$ --Lu $_{2}$ O $_{3}$ edge of the concentration triangle. From melts close to the composition NdScO $_{3}$ , the P-phase (perovskite) can be crystallized and mixed crystals with second end member NdLuO $_{3}$ have been grown from the melt. Crystals of this mixed perovskite were grown by the micro-pulling-down and Czochralski methods.

16 pages, 8 figures, submitted to J. Crystal Growth

Investigation of the Nd2​O3​--Lu2​O3​--Sc2​O3​ phase diagram for the preparation of perovskite-type mixed crystals NdLu1−x​Scx​O3​

Abstract

Investigation of the Nd $_{2}$ O $_{3}$ --Lu $_{2}$ O $_{3}$ --Sc $_{2}$ O $_{3}$ phase diagram for the preparation of perovskite-type mixed crystals NdLu $_{1 - x}$ Sc $_{x}$ O $_{3}$